Canonical has unveiled a complete branding overhaul, redesigning everything from the Ubuntu website to its logos and marketing material. However, what interests me more are the new Gtk+ themes, and even then, I'm not interested in the colour choices and the like. No - what stood out to me right away was not the theme itself - but the placement of the titlebar widgets.

It's bad UI design if the location of important items moves too much. The window close and minimize buttons would always be in a different position, depending on the window size.
Placing buttons in the corner makes them easy to find.